public class Book {
    private String title; 
    private String publisher;  
    private String author;  
    private String publishDate; 

    public Book(String title, String publisher, String author, String publishDate) {
        this.title = title;
        this.publisher = publisher;
        this.author = author;
        this.publishDate = publishDate;
    }

    public String getTitle() {
        return title;
    }

    public String getPublisher() {
        return publisher;
    }

    public String getAuthor() {
        return author;
    }

    public String getPublishDate() {
        return publishDate;
    }

    public void printBookInfo() {
        System.out.println("书籍信息：");
        System.out.println("书名: " + title);
        System.out.println("出版社: " + publisher);
        System.out.println("作者: " + author);
        System.out.println("出版日期: " + publishDate);
    }

    public static void main(String[] args) {
        Book book = new Book("大数据技术原理与应用", "人民邮电出版社", "林子雨", "2021-01");

        book.printBookInfo();
    }
}
